Question

rationalize the denominatory: 7by root15-2root5​

Answer 1

(7)/√15-2√5

{(7)/√15-2√5)}/{(√15+2√5)/(√15+2√5)}

(7√15+14√5)/{(√15)²-(2√5)²}

(7√15+14√5)/{15-20}

(7√15+14√5)/-5

(-7√5-14√5)/5